# SECRET SANTA RIDDLES

#### Search Suggestions

Trouble finding ? Here are some search terms related to to try browsing:
Terms · Privacy · Contact

## The Secret Santa Exchange

Hint: It's not as difficult as it seems. It's the number of ways the friends can form a circle divided by the number of ways the names can be drawn out of the hat.
1/10

For a group of n friends, there are n! (n factorial) ways to draw the names out of the hat. Since a circle does not have a beginning and end, choose one person as the beginning and end of the circle. There are now (n-1)! ways to distribute the remaining people around the circle. Thus the probability of forming a single circle is

(n-1)! / n!

Since n! = (n-1)! * n (for n > 1), this can be rewritten as

(n-1)! / (n*(n-1)!)

Factoring out the (n-1)! from the numerator and denominator leaves

1/n

as the probability.
Did you answer this riddle correctly?
YES  NO

## Post Your Secret Santa Riddles Below

Can you come up with a cool, funny or clever Secret Santa Riddles of your own? Post it below (without the answer) to see if you can stump our users.
1